You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
3.6 KiB
105 lines
3.6 KiB
# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
|
|
# Copyright (C) 2016 Coresec Systems AB
|
|
#
|
|
# Permission to use, copy, modify, and distribute this software and its
|
|
# documentation for any purpose with or without fee is hereby granted,
|
|
# provided that the above copyright notice and this permission notice
|
|
# appear in all copies.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
|
|
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
|
|
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
|
|
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS" AND CORESEC SYSTEMS AB DISCLAIMS ALL
|
|
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
|
|
# WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CORESEC
|
|
# SYSTEMS AB BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
|
|
# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
|
|
# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
|
|
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
|
|
# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
"""DNS name dictionary"""
|
|
|
|
import collections
|
|
import dns.name
|
|
from ._compat import xrange
|
|
|
|
|
|
class NameDict(collections.MutableMapping):
|
|
|
|
"""A dictionary whose keys are dns.name.Name objects.
|
|
@ivar max_depth: the maximum depth of the keys that have ever been
|
|
added to the dictionary.
|
|
@type max_depth: int
|
|
@ivar max_depth_items: the number of items of maximum depth
|
|
@type max_depth_items: int
|
|
"""
|
|
|
|
__slots__ = ["max_depth", "max_depth_items", "__store"]
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
self.__store = dict()
|
|
self.max_depth = 0
|
|
self.max_depth_items = 0
|
|
self.update(dict(*args, **kwargs))
|
|
|
|
def __update_max_depth(self, key):
|
|
if len(key) == self.max_depth:
|
|
self.max_depth_items = self.max_depth_items + 1
|
|
elif len(key) > self.max_depth:
|
|
self.max_depth = len(key)
|
|
self.max_depth_items = 1
|
|
|
|
def __getitem__(self, key):
|
|
return self.__store[key]
|
|
|
|
def __setitem__(self, key, value):
|
|
if not isinstance(key, dns.name.Name):
|
|
raise ValueError('NameDict key must be a name')
|
|
self.__store[key] = value
|
|
self.__update_max_depth(key)
|
|
|
|
def __delitem__(self, key):
|
|
value = self.__store.pop(key)
|
|
if len(value) == self.max_depth:
|
|
self.max_depth_items = self.max_depth_items - 1
|
|
if self.max_depth_items == 0:
|
|
self.max_depth = 0
|
|
for k in self.__store:
|
|
self.__update_max_depth(k)
|
|
|
|
def __iter__(self):
|
|
return iter(self.__store)
|
|
|
|
def __len__(self):
|
|
return len(self.__store)
|
|
|
|
def has_key(self, key):
|
|
return key in self.__store
|
|
|
|
def get_deepest_match(self, name):
|
|
"""Find the deepest match to I{name} in the dictionary.
|
|
|
|
The deepest match is the longest name in the dictionary which is
|
|
a superdomain of I{name}.
|
|
|
|
@param name: the name
|
|
@type name: dns.name.Name object
|
|
@rtype: (key, value) tuple
|
|
"""
|
|
|
|
depth = len(name)
|
|
if depth > self.max_depth:
|
|
depth = self.max_depth
|
|
for i in xrange(-depth, 0):
|
|
n = dns.name.Name(name[i:])
|
|
if n in self:
|
|
return (n, self[n])
|
|
v = self[dns.name.empty]
|
|
return (dns.name.empty, v)
|